Island



(No Model.) 1

Bi P. BAVILLE.

LATHE CHUCK. 180 877,59 Patented Feb. 7, 1888.1

, UNITED STATES PATENT OFFICE.

EDMOND PIERRE BAVILLE, OF BRUSSELS, BELGIUM, ASSIGNOR, BY MESNEASSIGNMENTS, TO STEPHEN NICHOLSON AND STEPHEN \VATERMAN, BOTH OFPROVIDENCE, RHODE ISLAND. I

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 377,596, dated February7,1888.

Application filed October 27, 1886. Serial No. 217,317. (No model.)Patented in England June 24, 1881, No. 2,771, and April Figure l is anaxial section of the improved.

- chuck on the line A B, Fig. 2; and Fig. 2 is a face view thereof.

I 5 A is the face-plate of the lathe, provided in the usual manner withgrooves or slots of any known shape for receiving and guiding thegripping-blocks, hereinafter fully described.

A is a crown-wheel which surrounds and fits snugly the cylindricalportion of thehub A of the face-plate A, being held in place thereon byan internally-screw-threaded ring, G, which is screwed onto thescrew-threaded extremity of said hub,and is there confined by apressure-screw, G.

The teeth of the wheel A gear with pinions a a a, fixed, respectively,to screws A A A, which occupy positions beneath the aforesaid grooves inthe face-plate A. The inner o extremities of these screws are slippedinto sockets in the hub A while their outer extremities are similarlyslipped in sockets in the rim or external flange of the plate A, wherebythey are confined against longitudinal move ment. As an'additionalsafeguard against the longitudinal movement of these screws, they arepassed through perforated steel plates B B B, between which and the hubof the 7 plate the pinions a a are confined.

o 0 O C are blocks fitted to slide in the grooves in the face-plateheretofore referred to, and confined to movement in proper planes bydovetails c, projecting beneath the undercut walls of said grooves, eachof said blocks being provided on its under side with a lug perforatedand internally screw-threaded for engaging the respective screws A A A",

whereby said blocks are moved in their bearings simultaneously toward orfrom the axis of the face-plate, according to the direction in which thewheel A is turned. Each of these blocks is provided with two or moresockets,

E, either of which is adapted to receive a lug or boss, f, projectingfrom the under side of a block ordog, F, F, or F, and also with screw-'threaded holes e forthe receptionof shoul dered screws D, which passthrough perforations in said block F, F, or F, whereby it is secured tothe top of the block 0, O, or 0.

The blocks F F F are shown in the drawings as secured near the outerextremities of the blocks 0 G C", respectively; but if it should befound that they do not approach each other sufficiently to grasp thearticle to be operated uponwhen the blocks 0 G C'shall have ar- I rivedat the inner extremity of their permitted movement, then the blocks F FF may beremoved and replaced with the bosses f and screws D in the holesE and e, which are nearer the inner extremities of the blocks 0 G O,respectively. If, after this, the blocks F F F do not approachsufficiently close, the article may be grasped between the innerextremities of the blocks 0 C O, which are grooved for this purpose. 7

It will be observed that the crownwheel A is not fixed to the hub of thechuck, so as to be incapable of turning independently of it, but thatthe face-plate is so fixed.

I am aware that it has been proposed toform the face-plate and hubseparately and secure to the hub cog-teeth which engage with the pinionscarried by the screws which actuate the gripping-dogs, said screws anddogs-being carried by said face-plate. vice, so long as the chuck isrotated in one direction, the tendency is to tighten the dogs or jawsupon the article; but if it is desired for any reason to reversethedirection in which the chuck is rotated, or if it is reversed acciodentally, the effect is to loosen the .bite of the jaws and permit thearticle to fall out.

Having thus described my invention what 'I claim as new therein, anddesire to secure by Letters Patent; is- 95 1. The combination, with thefaceplate A,

With such a de- I having the hub A formed integrally theredial screwsengaging said blocks and having 1 5 with, and the gripping-blocksadapted to slide the pinions secured thereto, the crown-wheel on saidfaceplate, of the radial screws enga A, surrounding and adapted to turnfreely ing said blocks and having the, pinions seupon the cylindricalportion of the hub, and

5 cured thereto, the crown-wheel A, surroundtheinternal]y-screw-threaded ring G, screwed ing and adapted to turn freelyupon the cylinonto the hub for holding the crown-wheel in 20 1 dricalportion of said hub, and the ring G, seplace, substantially as setforth.

cured to said hub for holding the wheel in In testimony whereoflhavehereunto set my place. hand.

[b 2. The combination, with the face-plate A having the perforated hub Aformed inte EDMOND PIERRE BAVILLE' grally therewith, and screw-threadedboth in Witnesses: ternally and externally, of the grippingblocks LEONDOOGUIER, adapted to slide on said face-plate, the ra AUG. FoERIssEN.

